Abi went shopping with thrice as much money as Tammy. After Abi spent $160, Tammy had thrice as much money as Abi had left. How much more money did Abi bring along for shopping than Tammy?
| |
Abi |
Tammy |
Difference |
| Before |
3x3 =
9 u |
1x3 =
3 u |
6 u |
| Change |
- $160 |
|
|
| After |
1 u |
3 u |
|
The amount that Tammy has remains unchanged at first and in the end. Make the amount that Tammy has the same. LCM of 1 and 3 is 3.
Amount that Abi spent
= 9 u - 1 u
= 8 u
8 u = 160
1 u = 160 ÷ 8 = 20
Amount that Abi brought along more than Tammy
= 9 u - 3 u
= 6 u
= 6 x 20
= $120
Answer(s): $120
